import java.util.Scanner;

public class luckCade {
    public static String[] imput(String[] args) {
        String[] a = new String[4];
        Scanner sc = new Scanner(System.in);
        for (int i = 0; i < 4; i++) {
            a[i] = sc.nextLine();
        }
        sc.close();
        return a;
    }
    public static int sum(String[] a) {
        int sum = 0;
        for (int i = 0; i < 4; i++) {
            sum += Integer.parseInt(a[i]);
        }
        return sum;
    }
    public static void main(String[] args) {
        int a = sum(imput(args));
        if (a == 24) {
            System.out.println("Lucky");
        } else {
            System.out.println("Unlucky");
        }
    }
}
